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Return to Abstracts of Patents Return to Abstracts of Patents 250-499 Patent Abstracts327. ------. [CARPENTER, G. B.] (E. I. du Pont de Nemours & Co.). Formic Acid. United States Patent 1,991,732, Feb. 19, 1935. Chem. Abs., vol. 29, 1935, p. 2179. See Canadian Patent 343,563 (abs. 323). |